get-alias-error

Server Error in '/' Application.

Method not found: 'System.String umbraco.interfaces.IApplication.get_Alias()'.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.MissingMethodException: Method not found: 'System.String umbraco.interfaces.IApplication.get_Alias()'.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[MissingMethodException: Method not found: 'System.String umbraco.interfaces.IApplication.get_Alias()'.]
   umbraco.BusinessLogic.Application.RegisterIApplications() +0
   umbraco.BusinessLogic.Application..cctor() +51

[TypeInitializationException: The type initializer for 'umbraco.BusinessLogic.Application' threw an exception.]
   umbraco.BusinessLogic.Application.get_SqlHelper() +0
   umbraco.BusinessLogic.User.setupUser(Int32 ID) +53
   umbraco.BusinessLogic.User.GetUser(Int32 id) +129
   umbraco.GlobalSettings.get_Configured() +110

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.1